|
Without a lot of detail, here's a rough idea.
Battery power goes to the headlight switch and then to that relay shown in the picture from "EdM". That is the stepping relay, every time you pull the LH stalk on the steering wheel the relay toggles between low beam and high beam and makes a distinctive "clunk" sound in doing so.
The high beams are NOT on the Bulb Failure Warning System, so the wires out from the stepping relay go direct to the bulbs. Two wires from the relay, L and R. At each side, they split again for the two bulbs.
The low beam IS on the bulb failure warning system, so the wire for them goes back into the cabin to that BFWS relay. There it comes out in two wires, one to the left bulb, one to right.
What can go wrong if the bulbs are OK? Corrosion and oxidization on the connectors to each bulb, and other places. Quick fix is to pull the connector off and put it back on, two or three times. Do that on all four bulbs and on the connector to the stepping relay. That usually scrapes off the oxidation.
Check the condition of all the wires around the lights. I have seen some with insulation just falling off, as if some acidic vapors from the battery ate it up.
See if that helps.
Good Luck,
Bob
:>)
PS: Consider getting yourself the Volvo Service Manual Wiring Diagrams, 1982 240. Visit www.volvotechinfo.com or call 1-800-25-VOLVO. The book may still be available. I have found that having that book for each of the 240s I've owned over the years has been invaluable. Not only does it contain the schematic diagrams that Haynes and Bentley copied, it has pages showing how each sub-system is wired, color codes, and a pictorial showing component location and number (to locate on the schematic).
|
